TITANIUM DIOXIDE DOPED WITH FLUORINE AND PROCESS FOR THE PRODUCTION THEREOF

摘要

A crystalline titanium dioxide containing fluorine atoms within the crystal lattice comprising atoms of titanium and oxygen is described; this titanium dioxide is particularly suitable for the production of solid-state electrolytes, hybrid membranes for fuel cells or electrolysers. The aforesaid titanium dioxide may be produced using a process comprising the following stages: (a) a titanium ore is reacted with a NH4HF2 aqueous solution; (b) the aqueous dispersion thus obtained is filtered with consequent separation of a solid residue and an aqueous solution containing titanium salts; (c) the aqueous solution thus obtained is subjected to hydrolysis, said hydrolysis comprising a first stage at pH 6.5-8.0 and a second stage at pH 9-11; (d) the aqueous dispersion thus obtained is filtered and the solid residue is subjected to pyrohydrolysis at a maximum temperature of approximately 500°C, preferably approximately 450°C.